Electronic and lattice properties of V/sub 2/Hf/sub 1-x/Ta/sub x/ C-15 superconductors
Journal Article
·
· Phys. Rev., B; (United States)
The heat capacities and magnetic susceptibilities chi (T) of the C-15 compounds V/sub 2/Hf/sub 1-x/Ta/sub x/ (T/sub c/ = 9-10 K), with x = 0.0-0.2, and V/sub 2/Ta (T/sub c/ = 3.6 K) have been measured between 1 and 350 K. Samples with x < 0.1 exhibit a heat-capacity anomaly indicative of a structural transformation. The geometric mean phonon frequencies ..omega../sub g/(T) were evaluated for these compounds and found to decrease monotonically with increasing chi (T) independent of temperature or composition. The high-temperature lattice properties of these materials and the presence or absence of a lattice transformation are explained in terms of the magnitude of their electronic density of states N/sub d/(E/sub F/) in the cubic phase. Strong electron-phonon coupling in the ternary compounds leads to large shifts in ..omega../sub g/(T) and, in some cases, to a structural transformation. The narrow range of T/sub c/ values for the ternary compounds occurs because their low-temperature lattice and electronic properties are similar, independent of whether or not a structural transformation has occurred.
- Research Organization:
- Argonne National Laboratory, Argonne, Illinois 60439
- OSTI ID:
- 5004861
- Journal Information:
- Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 17:7; ISSN PLRBA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOY SYSTEMS
ALLOYS
ELECTRON-PHONON COUPLING
ELECTRONIC SPECIFIC HEAT
HAFNIUM ALLOYS
LATTICE VIBRATIONS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTORS
TANTALUM ALLOYS
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TYPE-II SUPERCONDUCTORS
VANADIUM ALLOYS
VANADIUM BASE ALLOYS
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOY SYSTEMS
ALLOYS
ELECTRON-PHONON COUPLING
ELECTRONIC SPECIFIC HEAT
HAFNIUM ALLOYS
LATTICE VIBRATIONS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTORS
TANTALUM ALLOYS
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TYPE-II SUPERCONDUCTORS
VANADIUM ALLOYS
VANADIUM BASE ALLOYS